Use modifier keys that are pressed before activating a new window. Allows call of `wm_window_update_eventstate_modifiers` on `GHOST_kEventWindowActivate` by using `GetAsyncKeyState` instead of `GetKeyState` in GHOST_SystemWin32::getModifierKeys, which retrieves actual hardware state. Pull Request: https://projects.blender.org/blender/blender/pulls/110020